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双斑截尾寄蝇Nemorilla maculosa Meigen(双翅目:寄蝇科)是草地螟Loxostege sticticalis和其他鳞翅类昆虫的重要寄生天敌,但国内外对其生物学特性知之甚少。为了揭示双斑截尾寄蝇的生物学特性,在22℃,光周期16L∶8D的室内条件下对成虫羽化时期,交配持续时间,产卵量和寿命及其与补充营养的关系等进行了实验观察。结果表明:双斑截尾寄蝇主要在08:00-10:00和14:00-16:00羽化。雄蝇比雌蝇早羽化1d,雌蝇羽化后可立即进行交配,但雄蝇羽化1d后才可交配;交配持续时间为10～54min,但多数为20～30min;平均产卵量为154.1粒,雌蝇平均寿命26.6d,雄蝇为10.2d,雌雄寿命差异显著。取食10%蜂蜜水的平均产卵前期为3.8d,平均产卵历期为15.4d;而且取食10%蔗糖水、葡萄糖水或蜂蜜水之间的成虫产卵量没有显著差异,但均显著高于取食清水或纯饥饿空白对照的;同时,取食补充营养的雌蝇寿命均显著高于取食清水或空白对照的,但雄蝇的寿命则不受补充营养的影响。取食补充营养的雌蝇寿命与产卵量为正相关,即雌蝇的寿命越长,产卵量越大。最后,就这些结果的应用价值进行了讨论。
Nemorilla maculosa Meigen is an important parasitic natural enemy of Loxostege sticticalis and other Lepidoptera insects, but little is known about its biological properties at home and abroad. In order to reveal the biological characteristics of two-spotted flies, we studied the emergence period, mating duration, fecundity and life span of adult adults and their relationship with supplemental nutrition under indoor conditions of 22 ℃ and photoperiod 16L: 8D Experimental observation. The results showed that the two-spotted caterpillars were predominant in 08: 00-10: 00 and 14: 00-16: 00. The male flies emerged earlier than the female flies for 1 day. The female flies were mated immediately after emergence, but males could be mated for 1 day after emergence. The mating duration ranged from 10 to 54 minutes, but the majority was from 20 to 30 minutes. The average fecundity was 154.1 , The average life expectancy of female flies 26.6d, male flies 10.2d, significant differences in male and female longevity. The average pre-oviposition period of feeding 10% honey water was 3.8 days, and the average oviposition period was 15.4 days. However, there was no significant difference in fecundity between the 10% sucrose water, glucose water and honey water Significantly higher than that of fresh water or pure starvation control; meanwhile, the life span of female feeding foraging for nutrition supplementation was significantly higher than that of feeding fresh water or blank control, but the life span of male flies was not affected by supplemental nutrition. Females fed on nutritional supplements had a positive correlation with fecundity, that is, the longer the females’ life span, the larger the fecundity. Finally, the application value of these results is discussed.